Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance of R1234yf and R1234yf/R134a Mixture under Mobile Air-conditioner Operating Conditions

R1234yf와 R1234yf/R134a의 자동차 에어컨 작동 조건에서의 성능 평가

  • Park, Ki-Jung (Department of Mechanical Engineering, Inha University) ;
  • Lee, Yo-Han (Department of Mechanical Engineering, Inha University) ;
  • Choe, Dae-Seong (Department of Mechanical Engineering, Inha University) ;
  • Jung, Dong-Soo (Department of Mechanical Engineering, Inha University)
  • Received : 2010.08.06
  • Accepted : 2010.09.20
  • Published : 2010.12.10
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Abstract

In this study, performance of R1234yf and R1234yf/R134a mixture is measured on a heat pump bench tester in an attempt to substitute R134a used widely in mobile air conditioners (MACs). The bench tester is equipped with a open type compressor providing a nominal capacity of 3.5 kW. All tests are conducted under the summer cooling and winter heating conditions of 7/4 $5^{\circ}C$ and $-7/41^{\circ}C$ in the evaporator and condenser, respectively. For R1234yf/R134a mixture, measurements are made at 5%, 10%, and 15% of R134a by mass. Test results show that the coefficient of performance (COP) and capacity of R1234yf are up to 2.7% and 4.0% lower than those of R134a, respectively. For R1234yf/R134a mixture, the COP and capacity are up to 3.9% lower and 3.6% higher than those of R134a. For R1234yf and R1234yf/R134a mixture, the compressor discharge temperature is $4.1{\sim}6.7^{\circ}C$ lower than that of R134a while the amount of charge is reduced up to 11% as compared to R134a. 90%R1234yf/10%R134a is a better refrigerant than pure R1234yf in that it is less flammable and more compatible with existing R134a system. Based upon the results, it is concluded that R1234yf and R1234yf/R134a mixture are long term environmentally friendly solutions to mobile air-conditioners due to their excellent environmental properties with acceptable performance.

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